{"id":20167,"date":"2022-03-11T13:56:05","date_gmt":"2022-03-11T08:26:05","guid":{"rendered":"http:\/\/www.pythonpool.com\/?p=20167"},"modified":"2024-01-01T14:04:54","modified_gmt":"2024-01-01T08:34:54","slug":"math-pi-python","status":"publish","type":"post","link":"https:\/\/www.pythonpool.com\/math-pi-python\/","title":{"rendered":"Best Ways to Use math.pi in Python"},"content":{"rendered":"\n<p>So you want to use pi or \u03c0 in your python code, then you are in for a treat. We will be covering Python&#8217;s math.pi method of math module. We will also be looking at other ways to use pi(\u03c0), for instance, numpy.pi and scipy.pi methods of numpy and scipy libraries also do the same job, so we will examine when to use which respective methods.<\/p>\n\n\n\n<p><strong>Before jumping on the topic, let&#8217;s take a brief refresher on pi(\u03c0):<\/strong><\/p>\n\n\n\n<div class=\"wp-block-media-text has-media-on-the-right is-stacked-on-mobile is-vertically-aligned-center\" style=\"grid-template-columns:auto 32%\"><div class=\"wp-block-media-text__content\">\n<p>Pi or \u03c0(greek letter) is the ratio of a circle&#8217;s circumference to its diameter. It is an irrational number. In other words, the number of digits beyond the decimal point is infinite. <em><strong>3.1415929<\/strong><\/em> or <em><strong>22\/7<\/strong><\/em> are two ways to write it. 14<sup>th <\/sup>March is observed as pi(\u03c0) day as 3, 1 &amp; 4 are the significant digits of pi(\u03c0).<\/p>\n<\/div><figure class=\"wp-block-media-text__media\"><img decoding=\"async\" width=\"500\" height=\"500\" src=\"http:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/pi-3.png\" alt=\"Circle Diameter\" class=\"wp-image-20243 size-full\" srcset=\"https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/pi-3.png 500w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/pi-3-300x300.png 300w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/pi-3-150x150.png 150w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/figure><\/div>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_74 counter-hierarchy ez-toc-counter ez-toc-transparent ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #990303;color:#990303\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #990303;color:#990303\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.pythonpool.com\/math-pi-python\/#mathpi_in_Python\" >math.pi in Python<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.pythonpool.com\/math-pi-python\/#Importing_mathpi_in_Python\" >Importing math.pi in Python<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.pythonpool.com\/math-pi-python\/#Examples_of_mathpi_in_Python\" >Examples of math.pi in Python<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.pythonpool.com\/math-pi-python\/#Example_1_Calculate_a_circles_circumference_while_the_radius_is_provided_through_an_input_stream\" >Example 1: Calculate a circle&#8217;s circumference while the radius is provided through an input stream.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.pythonpool.com\/math-pi-python\/#Example_2_Calculate_the_area_of_a_circle_while_the_radius_is_provided_through_an_input_stream\" >Example 2: Calculate the area of a circle while the radius is provided through an input stream.<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.pythonpool.com\/math-pi-python\/#mathpi_precision\" >math.pi precision<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.pythonpool.com\/math-pi-python\/#PI%CF%80_without_math_module\" >PI(\u03c0) without math module<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.pythonpool.com\/math-pi-python\/#Using_pythons_convention\" >Using python&#8217;s convention<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.pythonpool.com\/math-pi-python\/#Using_pconst_library\" >Using pconst library<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.pythonpool.com\/math-pi-python\/#Using_NumPy\" >Using NumPy<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.pythonpool.com\/math-pi-python\/#Using_SciPy\" >Using SciPy<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.pythonpool.com\/math-pi-python\/#FAQs_on_mathpi_in_Python\" >FAQs on math.pi in Python<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.pythonpool.com\/math-pi-python\/#Python_Math_PI_is_not_Defined\" >Python Math PI is not Defined<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.pythonpool.com\/math-pi-python\/#Mathpi_vs_nppi\" >Math.pi vs np.pi<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.pythonpool.com\/math-pi-python\/#FAQs\" >FAQs<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.pythonpool.com\/math-pi-python\/#Conclusion\" >Conclusion<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.pythonpool.com\/math-pi-python\/#Trending_Python_Articles\" >Trending Python Articles<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\" id=\"h-math-pi-in-python\"><span class=\"ez-toc-section\" id=\"mathpi_in_Python\"><\/span>math.pi in Python<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The math module provides the pi( \u03c0) constant value: numerous other constants and mathematical functions like power and <a href=\"https:\/\/en.wikipedia.org\/wiki\/Logarithm\" target=\"_blank\" rel=\"noreferrer noopener\">logarithmic<\/a>, trigonometric, special constants, etc.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-importing-math-pi-in-python\"><span class=\"ez-toc-section\" id=\"Importing_mathpi_in_Python\"><\/span>Importing math.pi in Python<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: python; title: ; notranslate\" title=\"\">\n# to use it like math.pi\nimport math\n\n# to use directly as pi\nfrom math import pi\n<\/pre><\/div>\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"155\" src=\"http:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/1-4-1024x155.png\" alt=\"importing pi from math module\" class=\"wp-image-20205\" srcset=\"https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/1-4-1024x155.png 1024w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/1-4-300x45.png 300w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/1-4-768x116.png 768w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/1-4-1536x232.png 1536w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/1-4.png 1666w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Importing pi from the math module<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-examples-of-math-pi-in-python\"><span class=\"ez-toc-section\" id=\"Examples_of_mathpi_in_Python\"><\/span>Examples of math.pi in Python<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Example_1_Calculate_a_circles_circumference_while_the_radius_is_provided_through_an_input_stream\"><\/span><strong>Example 1: Calculate a circle&#8217;s circumference while the radius is provided through an input stream.<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: python; title: ; notranslate\" title=\"\">\nimport math\n\nradius = int(input(&quot;Enter radius:&quot;))\ndef cal_circum(radius:int):\n    return f&quot;Circumference:{2*math.pi*radius} unit&quot;\nprint(cal_circum(radius))\n<\/pre><\/div>\n\n\n<p>The formula gives the circumference of a circle- <strong><em>2\u03c0R<\/em><\/strong>, where 2 and \u03c0 are <em>constants and R is the <span style=\"text-decoration: underline;\"><strong><a href=\"http:\/\/www.pythonpool.com\/matplotlib-circle\/\" target=\"_blank\" rel=\"noreferrer noopener\">circle&#8217;s<\/a><\/strong><\/span> radius.<\/em><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"144\" src=\"http:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/2-3-1024x144.png\" alt=\"circumference using math.pi\" class=\"wp-image-20214\" srcset=\"https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/2-3-1024x144.png 1024w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/2-3-300x42.png 300w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/2-3-768x108.png 768w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/2-3-1536x216.png 1536w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/2-3.png 1666w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Finding circumference using math.pi<\/figcaption><\/figure>\n\n\n<div class=\"monsterinsights-inline-popular-posts monsterinsights-inline-popular-posts-india monsterinsights-popular-posts-styled\" ><div class=\"monsterinsights-inline-popular-posts-text\"><span class=\"monsterinsights-inline-popular-posts-label\" >Trending:<\/span><span class=\"monsterinsights-inline-popular-posts-border\" ><\/span><div class=\"monsterinsights-inline-popular-posts-post\"><a class=\"monsterinsights-inline-popular-posts-title\" style=\"font-size:18px;\" href=\"https:\/\/www.pythonpool.com\/fixed-typeerror-cant-compare-datetime-datetime-to-datetime-date\/\">[Fixed] typeerror can&#8217;t compare datetime.datetime to datetime.date<\/a><\/div><\/div><\/div><p><\/p>\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Example_2_Calculate_the_area_of_a_circle_while_the_radius_is_provided_through_an_input_stream\"><\/span><strong>Example 2: Calculate the area of a circle while the radius is provided through an input stream.<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: python; title: ; notranslate\" title=\"\">\nimport math\n\nradius = int(input(&quot;Enter radius:&quot;))\ndef cal_area(radius:int):\n    return f&quot;Area:{math.pi*(radius**2)} unit sq.&quot;\nprint(cal_area(radius))\n<\/pre><\/div>\n\n\n<p><em>The formula gives the area of a circle &#8211; <strong>\u03c0*R<sup>2<\/sup><\/strong>, where \u03c0 is a constant and R is the circle&#8217;s radius.<\/em><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"144\" src=\"http:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/2-2-1024x144.png\" alt=\"area using math.pi\" class=\"wp-image-20213\" srcset=\"https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/2-2-1024x144.png 1024w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/2-2-300x42.png 300w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/2-2-768x108.png 768w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/2-2-1536x216.png 1536w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/2-2.png 1666w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Finding areas using math.pi<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-math-pi-precision\"><span class=\"ez-toc-section\" id=\"mathpi_precision\"><\/span>math.pi precision<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>math.pi by default provides 15 places of precision for the value of pi. However, if you want to get a more precise pi(\u03c0) value, you can do so by using a decimal of Python&#8217;s standard library.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: python; title: ; notranslate\" title=\"\">\nfrom decimal import *\nimport math\n\nprint(len(str(math.pi)))\n\ngetcontext().prec = 31\npi_precision = Decimal(22)\/Decimal(7)\nprint(len(str(pi_precision)))\n<\/pre><\/div>\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"129\" src=\"http:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/1-9-1024x129.png\" alt=\"Precision comparison\" class=\"wp-image-20325\" srcset=\"https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/1-9-1024x129.png 1024w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/1-9-300x38.png 300w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/1-9-768x97.png 768w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/1-9-1536x194.png 1536w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/1-9.png 1666w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Precision comparison<\/figcaption><\/figure>\n\n\n\n<p>By excluding &#8216;3&#8217; at the one&#8217;s place and the decimal, we get 15 and 30 digits of precision for math.pi and decimal, respectively. <\/p>\n\n\n\n<p>The most accurate value of pi is 62,831,853,071,796 digits and was achieved by the University of Applied Sciences (Switzerland) in Chur, Switzerland, on 19 August 2021.<\/p>\n\n\n<div class=\"monsterinsights-inline-popular-posts monsterinsights-inline-popular-posts-kilo monsterinsights-popular-posts-styled\" ><div class=\"monsterinsights-inline-popular-posts-text\"><span class=\"monsterinsights-inline-popular-posts-label\" >Popular now<\/span><span class=\"monsterinsights-inline-popular-posts-border\" ><\/span><span class=\"monsterinsights-inline-popular-posts-border-2\" ><\/span><div class=\"monsterinsights-inline-popular-posts-post\"><a class=\"monsterinsights-inline-popular-posts-title\"  href=\"https:\/\/www.pythonpool.com\/fixed-nameerror-name-unicode-is-not-defined\/\">[Fixed] nameerror: name Unicode is not defined<\/a><\/div><\/div><\/div><p><\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"h-pi-\u03c0-without-math-module\"><span class=\"ez-toc-section\" id=\"PI%CF%80_without_math_module\"><\/span>PI(\u03c0) without math module<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>You can use the value of pi(\u03c0) without using the math module. Let&#8217;s see how can we achieve this:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-using-python-s-convention\"><span class=\"ez-toc-section\" id=\"Using_pythons_convention\"><\/span>Using python&#8217;s convention<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>According to Python&#8217;s conventions, we can <span style=\"text-decoration: underline;\"><strong><a href=\"http:\/\/www.pythonpool.com\/python-e-constant\/\" target=\"_blank\" rel=\"noreferrer noopener\">define constants<\/a><\/strong><\/span> using capital variable names. The only drawback is that anyone can easily modify the value.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: python; title: ; notranslate\" title=\"\">\nPI = 22\/7\nprint(PI)\n<\/pre><\/div>\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"118\" src=\"http:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/2-4-1024x118.png\" alt=\"pi without math module\" class=\"wp-image-20294\" srcset=\"https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/2-4-1024x118.png 1024w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/2-4-300x35.png 300w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/2-4-768x89.png 768w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/2-4-1536x177.png 1536w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/2-4.png 1666w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Output 1<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-using-pconst-library\"><span class=\"ez-toc-section\" id=\"Using_pconst_library\"><\/span>Using pconst library<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Another way is to use the <em><strong>pconst library<\/strong><\/em>, which helps create constant values that can&#8217;t be modified, just like other languages like c, c++, java, etc. Firstly you need to install the pconst library.<\/p>\n\n\n\n<p>Code below, we try to change the constant value to 5, but the pconst library throws an error &#8220;Constant value of &#8216;PI&#8217; is not editable&#8221;, thus preventing any changes. Pconst can be used to define our own constants, which we don&#8217;t want to be modified.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>pip install pconst<\/code><\/pre>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: python; title: ; notranslate\" title=\"\">\nfrom pconst import const\n\nconst.PI = 22\/7\ntry:\n    const.PI = 5\nexcept Exception as e:\n    print(const.PI)\n    print(e)\n<\/pre><\/div>\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"144\" src=\"http:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/1-8-1024x144.png\" alt=\"pconst library for constants\" class=\"wp-image-20295\" srcset=\"https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/1-8-1024x144.png 1024w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/1-8-300x42.png 300w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/1-8-768x108.png 768w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/1-8-1536x216.png 1536w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/1-8.png 1666w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">pconst library doesn&#8217;t allow modifications<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-using-numpy\"><span class=\"ez-toc-section\" id=\"Using_NumPy\"><\/span>Using NumPy<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>If you want or work with arrays and matrices, the NumPy library is a clear choice. It has functions for working in the domain of linear algebra, Fourier transform, etc. It provides the constant pi(\u03c0). However, to use it, you must install it, depending on the case if you have Anaconda installed or not.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: python; title: ; notranslate\" title=\"\">\n# if you have anaconda installed in your system\nconda install numpy\n\n# if you have only python installed\npip install numpy\n<\/pre><\/div>\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img decoding=\"async\" width=\"1024\" height=\"170\" src=\"http:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/1-5-1024x170.png\" alt=\"pi(\u03c0) constant value using NumPy library\" class=\"wp-image-20215\" style=\"width:711px;height:118px\" srcset=\"https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/1-5-1024x170.png 1024w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/1-5-300x50.png 300w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/1-5-768x127.png 768w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/1-5-1536x254.png 1536w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/1-5.png 1666w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">pi(\u03c0) constant value using NumPy library<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-using-scipy\"><span class=\"ez-toc-section\" id=\"Using_SciPy\"><\/span>Using SciPy<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>SciPy is a scientific computation library that uses NumPy underneath. <span style=\"text-decoration: underline;\"><strong><a href=\"http:\/\/www.pythonpool.com\/numpy-factorial\/\" target=\"_blank\" rel=\"noreferrer noopener\">SciPy stands<\/a><\/strong><\/span> for Scientific Python. It&nbsp;provides more utility functions for optimization,<strong> <\/strong>stats, and signal processing.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: python; title: ; notranslate\" title=\"\">\n# if you have anaconda installed in your system\nconda install scipy\n\n# if you have only python installed\npip install scipy\n<\/pre><\/div>\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"170\" src=\"http:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/3-1-1024x170.png\" alt=\"pi using scipy library\" class=\"wp-image-20233\" srcset=\"https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/3-1-1024x170.png 1024w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/3-1-300x50.png 300w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/3-1-768x127.png 768w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/3-1-1536x254.png 1536w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/3-1.png 1666w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">pi(\u03c0) constant value using Scipy library<\/figcaption><\/figure>\n\n\n<div class=\"monsterinsights-inline-popular-posts monsterinsights-inline-popular-posts-golf monsterinsights-popular-posts-styled\" ><div class=\"monsterinsights-inline-popular-posts-text\"><span class=\"monsterinsights-inline-popular-posts-label\" >Popular now<\/span><span class=\"monsterinsights-inline-popular-posts-border\" ><\/span><span class=\"monsterinsights-inline-popular-posts-border-2\" ><\/span><div class=\"monsterinsights-inline-popular-posts-post\"><a class=\"monsterinsights-inline-popular-posts-title\"  href=\"https:\/\/www.pythonpool.com\/solved-runtimeerror-cuda-error-invalid-device-ordinal\/\">[Solved] runtimeerror: cuda error: invalid device ordinal<\/a><\/div><\/div><\/div><p><\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"h-faqs-on-math-pi-in-python\"><span class=\"ez-toc-section\" id=\"FAQs_on_mathpi_in_Python\"><\/span>FAQs on math.pi in Python<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1646845366954\"><strong class=\"schema-faq-question\">Q1. Should I use math.pi, numpy.pi or scipy.py?<\/strong> <p class=\"schema-faq-answer\">The math.pi is part of the built-in math library of Python, while the rest of the two have to be installed to make use of them. All three of them provide the same value. If you are looking to work on large data sets with numerous calculations, numpy or scipy are great options; otherwise, math.pi is the way to go.<img decoding=\"async\" width=\"1666\" height=\"338\" src=\"https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/4-2.png\" class=\"attachment-full size-full\" alt=\"\" style=\"max-width: 100%; height: auto;\" srcset=\"https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/4-2.png 1666w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/4-2-300x61.png 300w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/4-2-1024x208.png 1024w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/4-2-768x156.png 768w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2022\/03\/4-2-1536x312.png 1536w\" sizes=\"(max-width: 1666px) 100vw, 1666px\" \/><\/p> <\/div> <\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Python_Math_PI_is_not_Defined\"><\/span>Python Math PI is not Defined<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>To use pi in python,&nbsp; use: <strong>math.pi<\/strong> in your statement.&nbsp; It will give the value of pi as float &#8211; 3.141592653589793. If you&#8217;re getting the error message &#8220;math pi is not defined&#8221; in Python, it might be because you&#8217;re trying to use the constant pi without importing it from the math module. <\/p>\n\n\n\n<p>Here&#8217;s an example of how to use pi correctly in Python:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: python; title: ; notranslate\" title=\"\">\nimport math\n# Calculate the circumference of a circle of #radius 5\nradius = 5\nperi = 2 * math.pi * radius\nprint (peri)\n<\/pre><\/div>\n\n\n<p>In this example, we first import the math module using the import command. We then use the math.pi constant to calculate the circumference of a circle of radius 5. Prefixing pi with math tells Python to use the pi constant from the math module. Without this import statement, we would get the error message &#8220;NameError: name &#8216;pi&#8217; is not defined&#8221;.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Mathpi_vs_nppi\"><\/span>Math.pi vs np.pi<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The value of pi with both numpy and math modules is above fifteen digits accuracy. It&#8217;s a float value and accessing the pi value from both modules fetches the same result.&nbsp;<\/p>\n\n\n\n<p>The only difference is that math module doesn&#8217;t need any type of dependency but with numpy we need many additions.&nbsp;<\/p>\n\n\n\n<p>In case, you are using numpy functionalities beforehand, go for np.pi.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"FAQs\"><\/span>FAQs<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1683193392963\"><strong class=\"schema-faq-question\">How do you define pi in Numpy?<\/strong> <p class=\"schema-faq-answer\">Just import the numpy library.\u00a0 It is a predefined function.\u00a0<br\/>pip install numpy<br\/>import numpy as np<br\/>ans= np.pi<br\/>print(ans)<\/p> <\/div> <\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-conclusion\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The math module of Python has many valuable tools; one of them is math.pi, which helps in mathematical computations involving pi(\u03c0). We looked at other ways to do the same task, but since math.pi is a built-in method of the <span style=\"text-decoration: underline;\"><strong><a href=\"http:\/\/www.pythonpool.com\/precompiled-standard-library-in-python\/\" target=\"_blank\" rel=\"noreferrer noopener\">standard library<\/a><\/strong><\/span> and hence doesn&#8217;t depend upon additional libraries, unlike numpy.pi and scipy.pi. We also looked at the default python&#8217;s convention for defining constant values and the pconst library as a good alternative.<\/p>\n\n\n<div class=\"monsterinsights-widget-popular-posts monsterinsights-widget-popular-posts-delta monsterinsights-popular-posts-styled monsterinsights-widget-popular-posts-columns-2\"><h2 class=\"monsterinsights-widget-popular-posts-widget-title\"><span class=\"ez-toc-section\" id=\"Trending_Python_Articles\"><\/span>Trending Python Articles<span class=\"ez-toc-section-end\"><\/span><\/h2><ul class=\"monsterinsights-widget-popular-posts-list\"><li ><a href=\"https:\/\/www.pythonpool.com\/f-string-unmatched\/\"><div class=\"monsterinsights-widget-popular-posts-image\"><img decoding=\"async\" src=\"https:\/\/www.pythonpool.com\/wp-content\/uploads\/2023\/05\/f-string-unmatched-300x157.webp\" srcset=\" https:\/\/www.pythonpool.com\/wp-content\/uploads\/2023\/05\/f-string-unmatched-300x157.webp 300w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2023\/05\/f-string-unmatched-1024x536.webp 1024w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2023\/05\/f-string-unmatched-768x402.webp 768w, https:\/\/www.pythonpool.com\/wp-content\/uploads\/2023\/05\/f-string-unmatched.webp 1200w \" alt=\"Frustrated with Unmatched f-strings? 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We will be covering Python&#8217;s math.pi &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Best Ways to Use math.pi in Python\" class=\"read-more button\" href=\"https:\/\/www.pythonpool.com\/math-pi-python\/#more-20167\" aria-label=\"More on Best Ways to Use math.pi in Python\">Read more<\/a><\/p>\n","protected":false},"author":29,"featured_media":20397,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[15],"tags":[4898,4896,4894,4895,4897,4899],"class_list":["post-20167","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tutorials","tag-is-there-a-pi-function-in-python","tag-math-pi-precision-python","tag-math-pi-python-coding","tag-math-pi-python-volume","tag-python-math-pi-is-not-defined","tag-what-does-math-pi-do-in-python","infinite-scroll-item"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.1 (Yoast SEO v25.0) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Best Ways to Use math.pi in Python - Python Pool<\/title>\n<meta name=\"description\" content=\"math.pi, how to use it in python code? 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Should I use math.pi, numpy.pi or scipy.py?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"The math.pi is part of the built-in math library of Python, while the rest of the two have to be installed to make use of them. All three of them provide the same value. 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